Filter coffee is generally weaker then say, Espresso. (And by weak, I mean, disolved coffee per volume of water) But, for a stronger brew, I suggest more coffee, and a longer brew time
I have been using the Aeromatic app to see what it people are up to with their Aeropress recipes and just kinda adjusting to see if I like it.
My first brews were with a darkish espresso blend, and it came out quite bitter, so I adjusted down the extraction time, this made a more palatable brew for myself and my wife.